The positioning of a gyro into a desired position and the maintaining of that position [15].

ERROR DETECTOR

The component in a servosystem that determines when the load has deviated from
its ordered position, velocity, and so forth [15].

ERROR REDUCER

The name commonly given to the servomotor in a servosystem. So named because
it reduces the error signal by providing feedback to the error detector [15].

ERROR SIGNAL

(1) In servosystems, the signal whose amplitude and polarity or phase are used to
correct the alignment between the controlling and the controlled elements. (2) The name given to the
electrical output of a control transformer [15].